must arch
Verbe régulier : arch - arched- arched

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must arch
you must arch
she must arch
we must arch
you must arch
they must arch 	I must be arching
you must be arching
she must be arching
we must be arching
you must be arching
they must be arching	I must have arched
you must have arched
she must have arched
we must have arched
you must have arched
they must have arched	I must have been arching
you must have been arching
she must have been arching
we must have been arching
you must have been arching
they must have been arching	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't arch
you mustn't arch
she mustn't arch
we mustn't arch
you mustn't arch
they mustn't arch 	I mustn't be arching
you mustn't be arching
she mustn't be arching
we mustn't be arching
you mustn't be arching
they mustn't be arching	I mustn't have arched
you mustn't have arched
she mustn't have arched
we mustn't have arched
you mustn't have arched
they mustn't have arched	I mustn't have been arching
you mustn't have been arching
she mustn't have been arching
we mustn't have been arching
you mustn't have been arching
they mustn't have been arching	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I arch?
must you arch?
must she arch?
must we arch?
must you arch?
must they arch? 	must I be arching?
must you be arching?
must she be arching?
must we be arching?
must you be arching?
must they be arching? 	must I have arched?
must you have arched?
must she have arched?
must we have arched?
must you have arched?
must they have arched? 	must I have been arching?
must you have been arching?
must she have been arching?
must we have been arching?
must you have been arching?
must they have been arching? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I arch?
mustn't you arch?
mustn't she arch?
mustn't we arch?
mustn't you arch?
mustn't they arch? 	mustn't I be arching?
mustn't you be arching?
mustn't she be arching?
mustn't we be arching?
mustn't you be arching?
mustn't they be arching? 	mustn't I have arched?
mustn't you have arched?
mustn't she have arched?
mustn't we have arched?
mustn't you have arched?
mustn't they have arched? 	mustn't I have been arching?
mustn't you have been arching?
mustn't she have been arching?
mustn't we have been arching?
mustn't you have been arching?
mustn't they have been arching?